View Full Version : Erm! Problem needs solved..

12th Mar 2006, 13:10
Mate of mine just emailed this thinking i might know...I don't...do you?:confused:

(delta)max = 2.898/temp (K) = wavelength in mm

Presuming the lightning bolt heated up to around 15,000K, we're talking about its maximum wavelength being in the UV range? (193nm/1.932E-4) Therefore it emits more UV than anything in the visible band?

Been given a task to work out what the colour of lightning would be based on its max wavelength emitted. The nearest visible colour that would come out strongest therefore would be violet at around 400nm?


12th Mar 2006, 13:26
Cobalt Blue with a touch of Island Mist and the merest hint of Bermuda Lime Green.

(Reference: Dulux Interior Colours)

12th Mar 2006, 13:28
:ok: Why thank you!


B Fraser
12th Mar 2006, 13:45
I would write you a couple of paragraphs but the rugby is just about to start. Your friend should refer to this page (http://www.egglescliffe.org.uk/physics/equations/planck/planck.html)

Allez France !

12th Mar 2006, 13:45
allan907......flash git. :}


There's this bear, this lion and this chicken.............:E

B Fraser - Black body radiation is now non PC. You could end up in prism!

Tis rainbow body radiation.

Thus, the correct answer is red, orange, yellow, green, blue, indigo, violet.

12th Mar 2006, 13:50
All very helpful indeed (even acbus1;) )

Just emailed the git back - should hopefully keep the saddo amused for a while:8

Thanks muchly:ok: